Microsoft's Software is Malware

Malware means software designed to function in ways that
mistreat or harm the user. (This does not include accidental errors.)
This page explains how Microsoft software is malware.

Malware and nonfree software are two different issues. The difference
between free software and
nonfree software is in
whether the users have control of the program or vice versa. It's
not directly a question of what the program does when it
runs. However, in practice nonfree software is often malware,
because the developer's awareness that the users would be powerless to fix
any malicious functionalities tempts the developer to impose some.

You might well decide to let a security service that you trust
remotely deactivate programs that it considers malicious.
But there is no excuse for deleting the programs, and you
should have the right to decide who (if anyone) to trust in this way.

I think a person or company has the right to cease to work on a
particular program; the wrong here is Microsoft does this after having
made the users dependent on Microsoft, so they are not free to ask
someone else to work on the program for them.